federal education officials announced today that five states will participate in an experiment to make students spend more time in school. meanwhile, many states are already implementing a new national approach, called the "common core state standards." special correspondent elizabeth brackett of public television station wttw reports on how that's working out in chicago. reporter: chicago elementary school students have walked these stairs for more than 100 years. named for the meat-packing tycoon this chicago public school is now 87% hispanic. like many inner-city schools it is on academic probation. >> you're going to write the main idea of the story on one post-it note. then you're going to rip off another. you're just going to write two character traits. >> reporter: but now this school is on the cutting edge of the biggest change in american education in years. it is one of a small group of chicago schools that is testing the new common course state standards. so far 46 states have adopted the standards which describe what every student needs to know from kindergarten through 12t